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Chapter 18 Classification

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1 Chapter 18 Classification
Organization and naming systems based on morphology and genetics Humans have a tendency to see commonalities and differences, clustering images by appearance.

2 Aristotelian classification
Life Plant Animal Herb Shrub Tree Aristotle grouped organisms based on appearance and abilities.

3 Why Classify? To study the diversity of life, biologists use a classification system to name organisms and group them in a logical manner. To avoid the confusion caused by regional common names. Texas bluebonnet (Lupinus texensis )

4 Taxonomy the science of classification
Uses Latin…descriptive, universal, “dead” language that never changes Uses binomial nomenclature Two word naming system of Genus & species = scientific name Uses hierarchy of categories from general to specific

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6 Common names Many people refer to organisms by common names rather than scientific names. Be careful that common names do not always reflect the biology of the organism. Example: starfish are not “fish”

7 Comparing related animals
Lynx Bobcat Lynx rufus, lynx Panthera concolor, mountain lion Lynx canadensis, bobcat Which two are more related? How do you know? Mountain lion

8 Dichotomous key: system to identify organisms and their scientific names
A key is made up of sets of numbered statements. Each set deals with a single characteristic of an organism, such as leaf shape or arrangement.

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10 Carolus Linnaeus ( ) Created a classification system with seven hierarchical levels Kingdom Phylum Class Order Family Genus species

11 Human classification:
Kingdom Animalia Phylum Chordata Class Mammalia Order Primates Family Hominidae Genus Homo species sapiens

12 KINGDOM Animalia PHYLUM Chordata CLASS Mammalia ORDER Carnivora
Giant panda Grizzly bear Black bear Abert squirrel Coral snake Red fox KINGDOM Animalia Sea star PHYLUM Chordata CLASS Mammalia ORDER Carnivora FAMILY Ursidae GENUS Ursus SPECIES Ursus arctos

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14 Classification of Human and Chimp
Level Human Chimp Kingdom Animalia Phylum Chordata Class Mamalia Order Primate Family Hominidae Pongidae Genus Homo Pan species sapien troglodytes

15 Kingdom…Phylum…Class…Order…Family… Genus species…(variety) or (breed)

16 Phylogeny Studying the evolutionary history and relationships of organisms

17 Cladograms Making a Family Tree
Represent evolutionary relationships, phylogeny, and not just physical appearances

18 Cladograms Cladistics: a phylogenic study that assumes how groups of organisms diverged and evolved Allosaurus Velociraptor Archaeopteryx Sinornis Theropods Flight feathers; arms as long as legs 3-toed foot; wishbone Down feathers Feathers with shaft, veins, and barbs Light bones

19 Traditional classification vs. Cladograms
Appendages Conical Shells Crustaceans Gastropod Crab Barnacle Limpet Crab Barnacle Limpet Molted exoskeleton Segmentation Tiny free-swimming larva CLASSIFICATION BASED ON VISIBLE SIMILARITIES CLADOGRAM BASED ON DERIVED CHARACTERS

20 Current six-kingdom classification
Archaebacteria: prokaryotic Eubacteria: prokaryotic Protists: eukaryotic Fungi: eukaryotic Plants: eukaryotic Animals: eukaryotic

21 Modern classification systems include the three-domain system which includes the 6 kingdom system.
Just a few years ago, all bacteria and some protists were labeled Monera.

22 Three Domain System DOMAIN EUKARYA DOMAIN ARCHAEA DOMAIN BACTERIA
Kingdoms Eubacteria Archaebacteria Protista Plantae Fungi Animalia

23 Key Characteristics of Domains and Kingdoms
Classification of Living Things DOMAIN KINGDOM CELL TYPE CELL STRUCTURES NUMBER OF CELLS MODE OF NUTRITION EXAMPLES Bacteria Eubacteria Prokaryote Cell walls with peptidoglycan Unicellular Autotroph or heterotroph Streptococcus, Escherichia coli Archaea Archaebacteria Prokaryote Cell walls without peptidoglycan Unicellular Autotroph or heterotroph Methanogens, halophiles Protista Eukaryote Cell walls of cellulose in some; some have chloroplasts Most unicellular; some colonial; some multicellular Autotroph or heterotroph Amoeba, Paramecium, slime molds, giant kelp Fungi Eukaryote Cell walls of chitin Most multicellular; some unicellular Heterotroph Mushrooms, yeasts Eukarya Plantae Eukaryote Cell walls of cellulose; chloroplasts Multicellular Autotroph Mosses, ferns, flowering plants Animalia Eukaryote No cell walls or chloroplasts Multicellular Heterotroph Sponges, worms, insects, fishes, mammals

24 Prokaryotic or eukaryotic Unicellular or multicellular
Six Kingdom classification Prokaryotic or eukaryotic Unicellular or multicellular Autotroph or heterotroph Archaebacteria Eubacteria Protista Fungi Plantae Animalia Pro Uni both Pro Uni both Eu most uni both Eu most multi hetero Eu multi auto Eu multi hetero

25 Archaebacteria overview
prokaryotic Most live in extreme environments such as swamps, deep-ocean hydrothermal vents, and seawater evaporating ponds. Most do not use oxygen to respire. Examples: Thermophiles, Halophiles, Methanogens

26 Eubacteria overview prokaryotic very strong cell walls
a less complex genetic makeup than found in archaebacteria or eukaryotes diverse habitat Examples: Strep, Lacto-bacillus, E. coli

27 Protist overview diverse species that share some characteristics.
eukaryote lacks complex organ systems lives in moist environments diverse metabolism

28 Protozoans: animal-like protists
Heterotroph: consume organic matter Unicellular Examples: Amoeba, paramecia

29 Algae: plant-like protists
Autotroph: uses light to make sugars through photosynthesis Lack roots, stems, and leaves Examples: algae, kelp, sea-weed

30 Fungus-like protists Decompose dead matter
Motility during some stage of life cycle No chitin in cell walls Examples: Slime-mold, powdery mildew

31 Fungi overview Eukaryotic Decomposes matter by absorbing materials
Multicellular or unicellular Examples: bread mold, mushrooms, athletes foot, ring worm

32 Plant overview Eukaryotic Multicellular Photosynthetic: produce oxygen
Immobile, sessile Cell walls Examples: fruit, ferns, mosses, trees, grasses

33 Animal overview Eukaryotic Multicellular Mostly mobile Lack cell walls
Diverse habitats Examples: lions, tigers & bears, oh my!

34 Evolution and the 6 Kingdoms
Nutritional types Auto(photo) Hetero(absorb) Hetero(ingest) Plantae Fungi Animalia (Seaweeds) Multi Uni Protista Eu Pro Bacteria Evolution and the 6 Kingdoms

35 Prokaryotic or eukaryotic Unicellular or multicellular
Six Kingdom classification Prokaryotic or eukaryotic Unicellular or multicellular Autotroph or heterotroph Archaebacteria Eubacteria Protista Fungi Plantae Animalia Pro Uni both Pro Uni both Eu most uni both Eu most multi hetero Eu multi auto Eu multi hetero

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37 Classification systems video
Click on image to play video.

38 Click on image to play video.
Panthera leo? (1) Click on image to play video.

39 Click on image to play video.
Panthera leo? (2) Click on image to play video.

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